Brake dressing and process therefor



Patented Nov. 6, 1934 BRAKE DRESSING AND PRQCESS THEREFOR Walter R.Thurston, Los Angeles, Calif.

No Drawing. Application April 9, 1930,

Serial No. 443,007

8 Claims;

My invention relates to dressings for brake linings and the process forproducing the same, as well as its application to said linings, saidinvention being more particularly adapted for I the. linings of brakesused in oil well practice, but in its broader aspects being equallyuseful and efficacious for brakes of all kinds, in all industries, suchas those used in hoisting equipments, in mining, motor vehicle brakes;in short,

10 wherever a brake of any sort or character is used.

It accordingly is an object of my invention to provide a novel form ofdressing for brake linings, which may be applied thereto in any suitableway, and may be so done in numerous ways,

said dressing comprising an'intimate mixture in varying quantities andproportions, of a set of preferably powdered metals, soft in character,such as a metal of the lead group, as lead, one from the magnesiumgroup, such as zinc, one

from the tin group, such as tin, and a soft mineral, also preferablypowdered, such as a hydrous silicate of magnesium, found in nature, asfor example, talc, the quantities and proportions used in practice beingcapable of variation, but

18 the lead being preferably the predominating ingredient of themixture.

A further object of my invention is to provide a novel form of binderfor holding the various ingredients of my novel form of compositiontogether, which preferably consists of a suitable lubricating oil,preferably having a heavy base, intimately mixed with a material whichis adapted to increase the viscosity of said oil, such, for example, aswool grease, to which are added at .35 least one or more anti-slippingmaterials, such as rubber, or rosin, or both, either or both of whichmay be in solution, preferably held so in saturated condition by asuitable solvent, such, for example as benzol.

A still further object of my invention is to provide a novel form ofprocess of producing my novel form of composition, together with itsbinder, and the novel manner in which said composition may be applied tothe brake linings.

45, The above and further objects and advantages of my invention, aswill hereinafter more fully appear, I attain by the composition andprocess described in its preferred formin the specification forming apart of my application.

'501 In its broader aspects, my invention comprises the production of abrake dressing consisting of a set of soft metals, having anti-frictionqualities, mixed in suitable proportions and quantities, which may inpractice be varied, with a soft min- 552 eral, such as a hydroussilicate of magnesium, as

for example, talc, all being preferably in powdered form and heldtogether by a suitable binder, which may comprise in varying quantitiesand proportions, an intimate mixture of a lubricating oil having a heavybase, a material to increase the viscosity of said oil, such as Woolgrease, and one or more anti-slipping materials, such as rubber, rosin,and the like, preferably held in saturated solution by a suitablesolvent, such as benzol.

More specifically, I first prepare the binder, which may comprise alubricating oil having a heavy base, and to this I add in suitable.quan-, tity an ingredient for increasing the viscosity of said oil,such as wool grease, the proportions of which may be two to one, that isto say, the quantity of oil may be four or more pounds, while the woolgrease may be two pounds, although I do not desire to be limited to saidproportions. Rubber of a suitable variety is now dissolved in a solventsuch as benzol. I have found in practice that one-half a pound of suchrubber, forming a saturated solution is very emcacious, and a likequantity of rosin, also in saturated solution, are added to the mixture.It will of course be un derstood that other anti-slipping materials maybe substituted for these, and still remain within the province of myinvention.

Said binder is now thoroughly stirred, so that an intimate mixture willbe formed, any means in practice found desirable for said stirring beingused, after which the quantities of powdered lead, zinc, tin and talcare added, and intimately mixed with said binder, which results in aheavy paste having such a consistency that, if desired, said paste maybe spread upon the inner surface of the brake linings with a suitableimplement, such as a flat knife.

But my invention may be applied to said linings in other ways, such, forexample, as impregnating said linings with said paste in any preferredway, so that an even coating of the dressing may be formed upon theinner surface of said linings.

By reason of the character of the dressing, it will in no way becomeattached to the brake drums with which said linings are associated, nohard lumps being formed, which will have a tendency to injure thesurface of the lining, thus increasing its life, and at the same timeprevent said drums from scoring.

If desired, also, said dressing or composition may be applied by meansof grease cups, tapped into said linings, or said composition may beforced into said linings by pressure and be impregnated therein, in anyway in practice preferred. This provides a plastic metallic, and withalan anti-slipping surface on the inner face of the brake linings,preventing slipping and creeping of the brake drum, forming a greaterand more eflicacious and efficient braking area than heretoforepossible, affording a maximum braking efiect with a minimum effort uponthe part of the operator.

It will also be apparent that all noise in making brake application isreduced to a minimum, avoiding squealing and chattering of the brakes,and at the same time eliminating smoking usually attendant when ordinarylinings or even dressed linings are used; in any event, reducing saidsmoking to a minimum, by reason of the metallic surface created, and atthe same time its anti-slipping quality hereinbefore described.

In accordance with the provisions of the patent statutes, I havedescribed the principle of operation of my invention together with theprocess and composition which I now consider to represent the bestembodiment thereof; but I desire to have it understood that said processand composition described is only illustrative, and that the inventioncan be carried out by other means.

I claim:

1. A brake dressing comprising an intimate mixture of zinc, lead, tin invarying quantities, talc, and a binder composed of .a lubricating oil,wool grease, a solution of rubber and a solution of rosin, also invarying quantities.

2. A binder for a brake dressing comprising a lubricating oil having aheavy base, wool grease, a saturated rubber solution, and a saturatedrosin solution.

3. A binder for a brake dressing comprising a mixture of a lubricatingoil, wool grease, rubber and rosin.

4. The process of forming a binder for a brake dressing which consistsin intimately associating in varying proportions a lubricating oilhaving a heavy base with a saturated rubber solution of benzol, woolgrease and a saturated rosin solution of benzol.

5. The process of forming a brake dressing which consists in mixing alubricating oil with Wool grease in the proportions of two to one,adding to said mixture rubber dissolved in benzol, thoroughly stirringsaid mixtures, and adding thereto powdered lead, zinc and talc.

6. The process of preparing a brake dressing which consists in mixing atleast one powdered metal of a set of such metals having lubricatingqualities, said metals comprising zinc, tin and lead, with a binderprepared by mixing a heavy lubricating oil with a greasy material forincreasing its viscosity and a saturated rubber benzol solution.

7. The process of forming a dressing for a brake lining which consistsin first forming a binder of a lubricating oil having a heavy base,adding to said lubricating oil a greasy ingredient to increase itsviscosity, next adding a saturated solution of rubber in benzol, nextadding a saturated solution of rosin in benzol, stirring said binder toform an intimate mixture, then adding to said binder powdered lead,zinc, tin and talc, and intimately mixing the latter with said binder toform a substantially heavy paste.

8. The process of forming a binder for a brake dressing which consistsin adding a greasy material to a lubricating oil having a heavy base toincrease the viscosity of said oil, then, adding a saturated solution ofrubber and benzol, then adding a saturated solution of rosin, and thenstirring to form an intimate mixture of said materials.

WALTER R. THURSTON.

